Machine tool coolant system



Filed NW. 30, 1942 2 Sheets-Shoat 2 INVENTORS WILLIAM F GROENE HARQLD J. S\EKMANN W. F. GROENE ETAL MACHINE TOOL COOL-ANT SYSTEM l I 5/ jHLJlL FLMM rzu UL FL FL FL ,WL "Hm WIL FL rlL T Aug. 10, 1943.

. r WN% a @H E m on J l! r F m ATTORNEY.

Patented Aug. 10, 1943 UNITED STATES PATENT OFFICE MACHINE TOOL C'OOLANT SYSTEIVI corporation of Delaware Application November 30, 1942, Serial No. 467,284

(Cl. 29--2'l') 2 Claims.

This invention pertains to machine tool coolant systems and is particularly related to lathes for combined turning and boring of relatively long tubular work pieces such as gun barrels or the like.

In the simultaneous boring and turning of work pieces of the character of gun tools the problem of supplying coolant is complicated by the fact that the cutting tools on the turning carriages for machining the outside of such tubes requires coolant to be distributed at relatively low pressure and high volume to the turning tools, while the boring tools operating in the boring bar inside of the bore of the tube must be supplied with coolant at relatively high pressure and lower volume so as not only to adequately cool the boring tool but also to efi'ect the forcing out of the chips removed in the bore of the tube with sufiicient high pressure to make sure of their discharge from the end of the hole being bored in the tube. Thus two distinctly different considerations must be had, namely that of providing relatively low pressure high volume coolant fluid to the turning tool while at the same time providing low volume high pressure coolant for the boring tool operating inside of the tube being machined. It is a further object to accomplish this simultaneous application of the coolant to both the boring and turning tool from a single source of supply and with a simplified system of coolant distribution to efifect the most efficient operation of the various cutting tools operating simultaneously.

One of the objects of this invention to accomplish this result is to provide a basic storage reservoir for the coolant for the machine in which is operated a low pressure high volume coolant distributing pump which directly transmits coolant through appropriate conduits to the turning tool slide where it is applied to the various turning tools operating on the outside of the work piece being machined. It is also a further object to provide a high pressure low volume pump movable directly with the boring bar and directly connected to the coolant distributing passages in it which serves low pressure high volume coolant to the cutting tool on the end of the boring bar operating inside of the work piece. charging arrangement whereby the low pressure high volume coolant pump for the turning tool It is then the object to provide a superpressure pump a pump operating under pressure which is adapted to prevent any sediment, forsign matter, or chips from passing to the high pressure pump for the boring bar and to incorporate in conjunction with this pump a suitable filter to further safeguard this supercliarging circuit from foreign matter.

In the drawings Figure I is a front elevational view of the left hand portion of a combined gun boring and turning lathe particularly showing the boring bar carriage with coolant pump mounted thereon.

Figure II is a front elevational view of the central portion of said lathe showing one of the turning carriages mounted on the central head portions thereof.

Figure III is a front elevational view of the right hand end of the lathe showing the headstock driving transmission and the other of the turning tool carriages.

Figure IV is a diagrammatic circuit diagram of the hookup of the coolant supply system.

This particular coolant system is especially adapted for application to a gun boring lathe compris g bed portions i, 2, and 3 appropriately mounted on suitable legs 4 and bolted together lengthwise so as to form a substantially continuous integral bed portion for the entire machine. On the right hand end of the bed 3 shown in Figure III is the lathe headstock 5 having an appropriate chuck 5 which grips a work piece or gun barrel 1 to be turned and bored. The work 1 is appropriately supported in suitable steady rests 8 and 9 mounted on the bed 3. On the left hand end of this lathe assembly, as shown in Figures I and II, is mounted the boring bar carriage l0 and the supplemental carriage ll carrying the high pressure low volume coolant pressure pump valve which is driven by a motor i3 and supplies coolant through a line hi to the boring bar E5 of the boring bar carriage Ill.

On the bed 3 is mounted the turning carriages l5 and IT as best seen in Figures II and III respectively which have appropriate cutting tools mounted on slides l8 and I9 respectively for machining the outside portion of the work piece 1.

7 primary source for coolant for both the carriages also supplies the supercharged pressure to the high pressure'pump for the boring bar. It is also an object to provide in connection with, the supercl'iarging arrangement for the high boring bar l5 and its tools and the carriages l6 and I1 and their tools is derived from a main storage reservoir or tank Eli as seen in Figure .;III and in which operates a low pressure high Volume coolant pump 2| from which coolant is directed through a line 22 to the turning carria ze l6 and through a line 23 to the turning earriane ll. from where the coolant of high volume and low pressure is applied to the H.- speetive l'lltt llf-l tools n these carriages.

A third line also issu r; forth from the pump BI and deliver:- flu d UIJUM rvlutivo y low {)lt'dfilll'v l) :1 sump tunl; 5 iUl'itt tll .z!. the headstock end or thcmachine as shown in Figure IIIv This tank ir: rn-ilntairmd under lu l fluid pressure and d rwrlmi 'u of fluid l!'(lll .itlil t'l ik takes place through on approprinl'. filter 25 through the disehnme lini- 2i whereby pressure from the pump 2| supercharges the input side of the high pressure pump l2 for the boring bar so as to maintain th s pump at all times in high operating eifieiency. The sump 25 is; under pressure at all times and with relntiwrly low volume passing th'ouph line 2 the sump 25 and line 23 because of the shin. \"(lllllrii'tllt (opacity of the intulu: oi the pump l2. Th s will remove subsmntii-i y ell lorei'zn IIWHIlFLi b3: settlement and sedimentation and the filter 2E arsociated wi-h this sump wi l infil -v tulle out the lruzt VtfitilL-S o. loleiml math-r wlncl'l lf glut rouse euro-1o; in the hi h prcmsu r lzw volume pump I? in li' boring liar.

Harirr: liin s iorth and dear-xii d (x1: invention \"l-.-l (181712 (is new and des M seeuqe by United St aws Letters Potent is:

1. In a machine tool. a bed, a headstock mounted on said bed, means for chucking and rotating a gun barrel or tube in said lathe, turning tool carriages mounted on said bed having Cutting tools operating on the outside ol said tubes, a boring bar carriage having a boring bar with cutting tools operating inside of the bore of said gun barrel, a low pressure high volume fluid pressure pump connected to supply coolant to said turning tool carriages at relatively high volume and low pressure, a high pressure pump associated with said boring bar, and means for connecting said pump to said boring bar and its cutting tools to supply fluid pressure at high pressure low volume thereto, and means interconnecting said low pressure pump and said high presrzure pump so as to effect a supercharging of said high pressure pump by said low pressure pump.

2. In a machine tool, u D a headstock mounted on said bed, means for chucking and rotating a gun barrel or tube in said 1athe, turn ing tool carriages mounted on said bed having cutting tools operating on the outside of said tubes, a boring bur carrizute having: a Jullill'i bar with euttlne tools opoiuing i; e of the bore oi m d pin barre? u low pwnmsul liiuli volunu flu: pr, 'u 't pump CUHllEPt i'i '0 supply coolant i.: i:l turning tool (zen-lane: t ruut vely higth wiinu: and low pres-sure. a ht Ur. mm pump oi-mt 1 rmtn. Said L rm? In? 1 W. fins 10* run .11 plum. ti and its (l1 ting l'iisupply Flu d ii s uiw all. hlf il l resili Ion p ume thj-rr o, {llj ineuiis nter ecnnetiing sui-ji low pycszure pump and said high pre. ure p12. so as to afloat o. superoharging of said 11' h p more pump lay said low p pump, and filtering, means interconnected be tween said low pressure pump and said high pressure pump to effect elimination of foreign matter from entry in said hig' h pressure pump.

WILLIAM F. GROENE HAROLD Jr SIEKMANN. 

